Given:-
The mean of 40,50 and 90 is P. If the mean of 40,50,90 and P is Q.
To find:-
The value of Q.
So now the mean of 40,50 and 90 is P. so we get,
So the value of p is 60.
Also we have the mean of 40,50,90 and P is Q. so we get,
So the value of q is 60.